4-56. 4-57. 4-58. 4-59. 4-60. When designing and building a LAN system, all workstations must be from the same  manufacturer. 1.   True 2.   False The OSI reference model is used to define which of the following communications    standards? 1.  Interconnection  of  communications facilities 2.  Software 3.  Hardware 4.   Protocol What layer of the OSI reference model describes the electrical, the mechanical, and the functional interface of the communications  channel? 1.  Physical  layer 2.  Data  link  layer 3.   Network   layer 4.   Transport   layer What layer of the OSI reference model establishes and deletes host-to-host connections across the network? 1.  Data  link  layer 2.   Network   layer 3.   Transport   layer 4.  Session  layer As  a  translator  for  the  network,  what layer of the OSI reference model provides a common representation for data which can be used between the application processes? 1   . 2 . 3 . 4. Network  layer Transport  layer Session layer Presentation  level/layer 4-61. Which of the following layers of the OSI reference  model  provides  error-free transmission  of  information  over  the physical  medium? 1.  Physical 2.  Data  link 3.   Network 4.   Transport 4-62. Communications between users on two different machines are established by what  layer  of  the  OSI  reference  model? 1.  Data  link 2.   Network 3.  Transport 4.   Session 4-63. Based on network conditions and priority of service, what layer of the OSI reference model decides which physical pathway the data should take? 1.   Physical 2.  Data  link 3.   Network 4.   Transport 4-64. The application level/layer of the OSI reference  model  provides  the  protocols for which of the following user items? 1.  Media  interface 2.  Electronic  mail 3.  Routing  of  messages  between networks 4.  Data  compression 4-65. Which of the following is NOT a LAN topology? 1.  Linear 2.   Ring 3.  Star 4.   EtherNet 35